2020A&A...640A..48L


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET03:09:46

2020A&A...640A..48L - Astronomy and Astrophysics, volume 640A, 48-48 (2020/8-1)

Masses for the seven planets in K2-32 and K2-233. Four diverse planets in resonant chain and the first young rocky worlds.

LILLO-BOX J., LOPEZ T.A., SANTERNE A., NIELSEN L.D., BARROS S.C.C., DELEUIL M., ACUNA L., MOUSIS O., SOUSA S.G., ADIBEKYAN V., ARMSTRONG D.J., BARRADO D., BAYLISS D., BROWN D.J.A., DEMANGEON O.D.S., DUMUSQUE X., FIGUEIRA P., HOJJATPANAH S., OSBORN H.P., SANTOS N.C. and UDRY S.

Abstract (from CDS):


Context. High-precision planetary densities are key pieces of information necessary to derive robust atmospheric properties for extrasolar planets. Measuring precise masses is the most challenging part of this task, especially in multi-planetary systems. The ESO-K2 collaboration focuses on the follow-up of a selection of multi-planetary systems detected by the K2 mission using the HARPS instrument with this goal in mind.
Aims. In this work, we measure the masses and densities of two multi-planetary systems: a four-planet near resonant chain system (K2-32) and a young (∼400Myr old) planetary system consisting of three close-in small planets (K2-233).
Methods. We obtained 199 new HARPS observations for K2-32 and 124 for K2-233 covering a long baseline of more than three years. We performed a joint analysis of the radial velocities and K2 photometry with PASTIS to precisely measure and constrained the properties of these planets, focusing on their masses and orbital properties.
Results. We find that K2-32 is a compact scaled-down version of the Solar System's architecture, with a small rocky inner planet (Me=2.1–1.1+1.3M, Pe∼4.35-days) followed by an inflated Neptune-mass planet (Mb=15.0–1.7+1.8M, Pb∼8.99-days) and two external sub-Neptunes (Mc=8.1±2.4M, Pc∼20.66-days; Md=6.7±2.5M, Pd∼31.72-days). K2-32 becomes one of the few multi-planetary systems with four or more planets known where all have measured masses and radii. Additionally, we constrain the masses of the three planets in the K2-233 system through marginal detection of their induced radial velocity variations. For the two inner Earth-size planets we constrain their masses at a 95% confidence level to be smaller than Mb<11.3M (Pb∼2.47-days), Mc<12.8M (Pc∼7.06-days). The outer planet is a sub-Neptune size planet with an inferred mass of Md=8.3–4.7+5.2M (Md<21.1M, Pd∼24.36-days).
Conclusions. Our observations of these two planetary systems confirm for the first time the rocky nature of two planets orbiting a young star, with relatively short orbital periods (<7-days). They provide key information for planet formation and evolution models of telluric planets. Additionally, the Neptune-like derived masses of the three planets, K2-32 b, c, d, puts them in a relatively unexplored regime of incident flux and planet mass, which is key for transmission spectroscopy studies in the near future.

Abstract Copyright: © ESO 2020

Journal keyword(s): planets and satellites: terrestrial planets - planets and satellites: composition - techniques: radial velocities - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/640/A48): k2-32lc.dat k2-32rv.dat k2-233lc.dat k2-233rv.dat>

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3037 0
2 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2713 0
3 BD+10 1799 * 08 26 27.8492347858 +10 04 49.334005301   9.42 8.92     F8 21 0
4 K2-95b Pl 08 37 27.0563002037 +18 58 36.022931591           ~ 22 0
5 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1269 0
6 K2-18b Pl 11 30 14.5176249117 +07 35 18.257210626           ~ 53 0
7 HD 106315b Pl 12 13 53.3965594147 -00 23 36.554390504           ~ 11 0
8 BD-05 3504b Pl 12 27 29.5848289637 -06 43 18.766035130           ~ 17 0
9 BD-19 4086c Pl 15 21 55.1981390204 -20 13 53.987442974           ~ 3 0
10 BD-19 4086b Pl 15 21 55.1981390204 -20 13 53.987442974           ~ 2 0
11 BD-19 4086d Pl 15 21 55.1981390204 -20 13 53.987442974           ~ 5 0
12 BD-19 4086 * 15 21 55.1981390204 -20 13 53.987442974   11.81 10.88     K3 7 0
13 K2-32b Pl 16 49 42.2601117834 -19 32 34.150055300           ~ 19 0
14 K2-32e Pl 16 49 42.2601117834 -19 32 34.150055300           ~ 3 0
15 K2-32d Pl 16 49 42.2601117834 -19 32 34.150055300           ~ 14 0
16 K2-32c Pl 16 49 42.2601117834 -19 32 34.150055300           ~ 16 0
17 K2-32 * 16 49 42.2601117834 -19 32 34.150055300   13.28 12.31 12.11   ~ 28 0
18 Kepler-411e Pl 19 10 25.3471338464 +49 31 23.711931326           ~ 3 0
19 Kepler-411 ** 19 10 25.3471338464 +49 31 23.711931326   13.70 12.55 12.26   K3V 53 0
20 Kepler-51 Ro* 19 45 55.1429734720 +49 56 15.650638630           ~ 86 1
21 Kepler-11 Ro* 19 48 27.6228219845 +41 54 32.902654079       14.00   G2V 302 1
22 Kepler-289c Pl 19 49 51.6736755661 +42 52 58.269661448           ~ 37 0
23 Kepler-289 Ro* 19 49 51.6736755661 +42 52 58.269661448           ~ 52 0
24 WASP-47 * 22 04 48.7262032385 -12 01 08.000987005     11.99 11.82   ~ 107 1
25 BD-15 6276b Pl 22 48 07.5636055806 -14 29 40.842304404           ~ 8 0
26 K2-138 * 23 15 47.7685349429 -10 50 58.897706806   13.01 12.21 12.12 11.40 ~ 10 0
27 K2-138b Pl 23 15 47.7685349429 -10 50 58.897706806           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-03:09:46

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